Abstract |
Membranes of a variety of clonal cell lines, including neuroblastoma x glioma hybrid NG108-15, glioma C6, Rat 1 and CHO fibroblasts and the pituitary-derived cell lines alpha T3 and GH3 were immunoblotted with an antiserum (CQ) raised against a synthetic peptide corresponding to the C-terminal decapeptide of the alpha subunits of the phosphoinositidase-C-linked G-proteins Gq and G11. In SDS-PAGE conditions able to resolve these two polypeptides, direct evidence was obtained for co-expression of these two G-proteins in all of the above cell lines. The ratio of these two G-proteins varied substantially (alpha 11/alpha q = 0.25-2.5) between the cell lines. In human platelets and in a range of haemopoietically derived human cell lines including U937 (monoblasts), Raji ( Burkitts lymphoma) and Jurkat (mature T cell) expression of G11 alpha was not detected. This was not due to the inability of the antiserum to identify human G11 alpha as other human cell lines co-expressed both G-proteins. A third, unidentified CQ reactive polypeptide of similar mobility was resolved and present in all cell lines examined.
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Authors | G Milligan, I Mullaney, J F McCallum |
Journal | Biochimica et biophysica acta
(Biochim Biophys Acta)
Vol. 1179
Issue 2
Pg. 208-12
(Nov 07 1993)
ISSN: 0006-3002 [Print] Netherlands |
PMID | 8218363
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Phosphoric Diester Hydrolases
- Phosphoinositide Phospholipase C
- GTP-Binding Proteins
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Topics |
- Animals
- Blood Platelets
(metabolism)
- Cell Line
(metabolism)
- Cell Membrane
(metabolism)
- GTP-Binding Proteins
(analysis, physiology)
- Gene Expression
- Humans
- Phosphoinositide Phospholipase C
- Phosphoric Diester Hydrolases
(analysis)
- Tumor Cells, Cultured
(metabolism)
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